Remove the Lifters from the left engine bank. There are 2 distinct oil passages going to each cylinder deactivation lifter bore, one for the hydraulic lash-adjusting feature of the lifter, and one for controlling the locking pins used for cylinder deactivation. Also, they make sure the engine has the correct oil pressure. Six-cylinder operation is used only at startup and for accelerating. Though Error Code P3400 may not generally be considered as a serious problem, it is important to fix it as soon as possible. In any case, you're still under waranty, so I'd let the dealer worry about it. During V8 mode, the locking pins are pushed outward by spring force, locking the pin housing and outer housing together causing the lifter to function as a normal lifter.
By actuating the solenoid, oil pressure is raised to the pair of lifters that coincide with each particular solenoid. Cylinder deactivation is timed so that the cylinder is on an intake event. Remove both Solenoids on Bank 1 of the engine block. If the entire engine is restricted disassembly of the entire engine block may be necessary. When the lifter pin housing is unlocked from the outer housing, the internal pin housing will remain stationary, while the outer housing will move with the profile of the camshaft lobe, which results in the valve remaining closed. Remove the Intake Manifold per Service Information. A bad one will not.
Besides the bulletin above, ask your Honda dealership if there are any others that might be in play. Remove the Bank 1 Cylinder Head per Service Information. ² Set Condition: O2 sensor readings on Bank 1 side indicate a lean condition while in 4 cylinder mode. The force exerted by the valve spring is acting on the side of the lifter locking pins, preventing them from moving until the intake valve has closed. If the cylinder deactivation solenoid 7 is working properly, inspect the oil passages to the lifter.
The outer housing contacts the camshaft lobe through a roller. Switching between V8 and V4 mode is accomplished in less than 250 milliseconds, making the transitions seamless and transparent to the vehicle operator. The scanner will also be used to clear the codes. ² When Monitored: Transition from 4 to 8cylinder mode. It will vibrate and make a clicking noise.
Oil passages that are restricted or clogged must be cleaned, as necessary. The same process will be completed — the technician will test the cylinder deactivation solenoid 7 by actuating it with the scan tool. During an intake event, the intake cam lobe is pushing the valve lifter upwards to open the intake valve against the force of the valve spring. However, when driving conditions are light, the engine will automatically downgrade its operation by deactivating 4 of the 8 cylinders, changing from V8 to V4 mode. A solenoid that is properly working will vibrate and make a clicking noise. Thus, technicians will check the oil passages and look for signs of debris, and clean the oil passages as necessary, if not replace the solenoid.
Let us know what they find. If it is a solenoid problem, the intake manifold has to come off. Customer interest bulletins often come with some help from the manufacturer that goes beyond the new car warranty terms. When the intake valve lifter reaches the base circle of the camshaft lobe, the valve spring force is reduced, allowing the locking pins to move, deactivating the intake valve. Can you feel and hear the Solenoid Actuating? Cylinder deactivation is accomplished by not allowing the intake and exhaust valves to open on the selected cylinders by using special valve lifters. This will then deactivate the cylinder 1, cylinder 4, cylinder 6, and cylinder 7, by restricting the flow of oil to the valve lifters of these cylinders, preventing the intake valves and exhaust valves from working.
The deactivation lifters contain spring loaded locking pins that connect the internal pin housing of the lifter to the outer housing. The engine will operate on 8 cylinders, or V8 mode, during engine starting, engine idling, and medium to heavy throttle applications. Can you feel and hear the Solenoid Actuating?. Next, they will test the cylinder deactivation solenoid 1 by actuating it with a scan tool. Could just be a loose connection. Posted on Aug 10, 2010. The spark plugs in the deactivated cylinders, the auto maker says, continue to fire in order to minimize plug-temperature loss and prevent fouling.
Another common symptom is that it causes the engine to vibrate. The ignition system secondary voltage or spark is still present across the spark plug electrodes on the deactivated cylinders. Lifters must be replaced as well if the oil passages are still restricted. The engine block may have to be disassembled if the whole engine is restricted. From what I understand about how this system works, the engine computer activates the control solenoids which pause the intake and exhaust valves. The pin housing contains the lifter plunger and pushrod seat which interfaces with the pushrod. If the cylinder deactivation solenoid 1 is working properly, the cylinder deactivation solenoid 7 will be the next one that will be checked.